Alex cautiously approaches the barrier, floating over until he 'stood' directly above it, giving it a good fifty yard gap. He nods at the warning, seemingly talking to open air.

"Don't worry, I was just reminded how I'm hardly infallible and this is clearly powerful magic. I mean to be cautious."

Taking his time, he drifts around the perimiter of the barrier. He studied it with everything he had at his disposal, running his well tuned sense of the mystic over it and wracking his mind for any clues. A barrier like this would do something. He just needed to figure out what, and how it was generated. As he saw it, either an object of power was responsible, or a person was. There was also the consideration that it was created from a single source, likely located at the center of the sphere.. or by multiple sources, most likely at each of the cardinal points of the compass.. He would scan for any concentrations of power in the building that looked like they matched either configuration..

(( I want to use Magic Sense and Occultist to try and figure out what this barrier does, or at least where it's source(s) are located.))